J. Comput. Mediat. Commun.最新文献_第4页

Filtered OFDM System Improvement Using Hamming Code 利用汉明码改进滤波OFDM系统

J. Comput. Mediat. Commun. Pub Date : 2023-04-01 DOI: 10.12720/jcm.18.4.215-220.

G. Hussain, Husam A. Wahhab, Y. Harbi

{"title":"Filtered OFDM System Improvement Using Hamming Code","authors":"G. Hussain, Husam A. Wahhab, Y. Harbi","doi":"10.12720/jcm.18.4.215-220.","DOIUrl":"https://doi.org/10.12720/jcm.18.4.215-220.","url":null,"abstract":"Orthogonal Frequency Division Multiplexing (OFDM) technique is widely adopted for broadband Forth Generation (4G) wireless communication systems at present, owing to its ability to combat multi-path interference. Nevertheless, it suffers from a large Peak to Average Power Ratio (PAPR) and Out Of Band Emission (OOBE), making it unsuitable for a high-speed transmission system. On the other hand, the Filtered-OFDM (f-OFDM) system is suggested to overcome the traditional OFDM system's disadvantages and maintain its advantages. Nowadays, the developments and growing communications systems are rapid, especially on their applications such as wireless networks, internet, satellite communications, mobile telephony, etc. This increases the demand for raising the bit rates with decreasing power consumption and the bit error rates (BER). In this paper, Hamming codes are proposed to improve the f-OFDM system performance, while the presence of the subband filter in system architecture could decrease the values of OOBE than the familiar OFDM system. The outcomes showed that utilizing interleaver with Hamming code considerably improves the proposed system performance, while the OOBE values were lower than the conventional OFDM system.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"394 ","pages":"215"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91461496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Evaluate the Security Models Performances and Limitations of the Vehicular Network VANETcloudSim 评估车载网络VANETcloudSim的安全模型、性能和局限性

J. Comput. Mediat. Commun. Pub Date : 2023-04-01 DOI: 10.12720/jcm.18.4.221-227

Abdelilah El ihyaoui, M. Youssefi, A. Mouhsen, Abdelhafid ELfarnane

引用次数: 0

Impact of Fading Channel to Energy Harvesting Relay on Cooperative Communication Systems 衰落信道对协同通信系统能量收集中继的影响

J. Comput. Mediat. Commun. Pub Date : 2023-04-01 DOI: 10.12720/jcm.18.4.207-214

N. Nasaruddin, E. Elizar, Afdhal Afdhal

{"title":"Impact of Fading Channel to Energy Harvesting Relay on Cooperative Communication Systems","authors":"N. Nasaruddin, E. Elizar, Afdhal Afdhal","doi":"10.12720/jcm.18.4.207-214","DOIUrl":"https://doi.org/10.12720/jcm.18.4.207-214","url":null,"abstract":"Channel conditions strongly influence the performance of the wireless communication system. Fading is one of the main problems caused by signal propagation via various paths. Recently, cooperative communication systems have been extensively studied to overcome this problem. However, the power consumption in the system relaying information to the destination increases, shortening the network's life. Therefore, this paper analyzes the impact of three Raleigh and Rician fading channel scenarios on cooperative communication performance in which a relay uses energy harvesting based on power splitting (EH-PS). The three scenarios are Rayleigh-Rayleigh fading (I), Rician- Rayleigh fading (II), and Rician-Rician fading (III). Subsequently, the throughput performance and energy efficiency are evaluated based on the maximum power splitting (PS) ratio. The simulation results indicate that the PS ratio in scenario III is higher than in scenarios I and II. Thus, the Rician fading channel can accumulate more energy in the relay due to the line-of-sight path between the source and the relay. Hence, scenario III's throughput and energy efficiency are higher than the other scenarios. The energy efficiency for scenario III is 33.08% and 12.14% higher than scenarios I and II, respectively. Therefore, the EH-PS cooperative communication system with the Rician fading channels has the highest throughput and is promising for future 5G technology.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"1 1","pages":"207-214"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90864179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Separation Distance for Frequency Coexistence between Unsynchronized Time Division Duplex 5G Private Networks at 4.7 GHz 4.7 GHz非同步时分双工5G专网频率共存的分离距离

J. Comput. Mediat. Commun. Pub Date : 2023-04-01 DOI: 10.12720/jcm.18.4.250-255

Hyuk-Je Kim, I. Lee

{"title":"Separation Distance for Frequency Coexistence between Unsynchronized Time Division Duplex 5G Private Networks at 4.7 GHz","authors":"Hyuk-Je Kim, I. Lee","doi":"10.12720/jcm.18.4.250-255","DOIUrl":"https://doi.org/10.12720/jcm.18.4.250-255","url":null,"abstract":"Frequency sharing problems may occur between neighboring networks when multiple operators build 5G private networks within a specific region. The interference between time division duplex (TDD) 5G private networks depends on various factors, such as frequency channels, synchronization, and building entry loss (BEL). In this study, we propose separation distances at which two 5G private networks in close proximity can coexist. The amount of interference according to the separation distance between the two 5G private networks was simulated by the Monte Carlo (MC) method. When the two networks operated in an outdoor environment and had different channels, there was a minimum interference effect even if the cell radii of the two networks overlap. However, the separation distance between networks using the same channel was simulated to be approximately 500 m. The TDD synchronization of two networks using the same channel reduced the separation distance to approximately 100 m. The additional radio wave attenuation by the BEL reduced the amount of interference, allowing frequency coexistence between networks even within the cell radii.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"35 1","pages":"250-255"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81132130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating Analog Self-Interference Cancellation for In-Band Full-Duplex Wireless Communication 评估带内全双工无线通信的模拟自干扰消除

J. Comput. Mediat. Commun. Pub Date : 2023-04-01 DOI: 10.12720/jcm.18.4.256-266

Jonathan Shilling, Chao Chen

{"title":"Evaluating Analog Self-Interference Cancellation for In-Band Full-Duplex Wireless Communication","authors":"Jonathan Shilling, Chao Chen","doi":"10.12720/jcm.18.4.256-266","DOIUrl":"https://doi.org/10.12720/jcm.18.4.256-266","url":null,"abstract":"In-band full-duplex (IBFD) technology allows simultaneous transmission and reception in the same frequency band to boost spectral efficiency. However, selfinterference, introduced by transmitter-to-receiver leakage, poses the biggest obstacle to the realization of IBFD. Altogether IBFD radio performance and effective network throughput are directly correlated with the amount of energy suppressed by self-interference cancellation (SIC). In this work a model of an IBFD transceiver, featuring an adaptive, analog-domain, tapped-branch self-interference canceller, was developed to evaluate the inimical effects attributable to the various noise and nonlinear distortions of the simulated transceiver components. Results of the simulation show that noise incursions and nonlinearity in the transmission channel produced a negligible effect on the overall cancellation performance. However, the effectiveness of the cancellation hardware is highly dependent on the level of intrinsic nonlinearity within the canceller’s own components. Consideration of these non-ideal characteristics should be an essential part of analog SIC design to prevent any intrinsic limitations on the cancellation performance.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"402 1","pages":"256-266"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86830908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Communication networks do not predict success in attempts at peer production 通信网络不能预测对等生产的成功尝试

J. Comput. Mediat. Commun. Pub Date : 2023-03-16 DOI: 10.1093/jcmc/zmad002

Jeremy Foote, Aaron Shaw, Benjamin Mako Hill

引用次数: 0

Different platforms, different uses: testing the effect of platforms and individual differences on perception of incivility and self-reported uncivil behavior 不同的平台，不同的用途:测试平台和个体差异对不文明感知和自述不文明行为的影响

J. Comput. Mediat. Commun. Pub Date : 2023-01-06 DOI: 10.1093/jcmc/zmac035

Daniel J. Sude, S. Dvir-Gvirsman

{"title":"Different platforms, different uses: testing the effect of platforms and individual differences on perception of incivility and self-reported uncivil behavior","authors":"Daniel J. Sude, S. Dvir-Gvirsman","doi":"10.1093/jcmc/zmac035","DOIUrl":"https://doi.org/10.1093/jcmc/zmac035","url":null,"abstract":"\u0000 Two large surveys with adult samples of Americans (N = 1,105; N = 1,035) investigated differences in perceived incivility between seven social media platforms. Perceptions of incivility were targeted, given both their inherent societal relevance and the personalized nature of each user’s platform experience. Utilizing a novel approach, observations per platform were nested within each user, facilitating disentangling user-level from platform-level factors. Study 1 demonstrated that even accounting for differences between users, perceptions vary by platform. Further, while individual users do admit to generating uncivil content themselves, self-perceptions were in contrast largely stable across platforms. Study 2 built upon Study 1 by investigating additional platform-level factors that could impact perceptions of incivility: Differences in perceived affordances between platforms were related to differences in perceptions of incivility’s prevalence. Specifically, platforms characterized by either perceived anonymity or perceived network association were in turn perceived to be more uncivil.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84651519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

People, places, and time: a large-scale, longitudinal study of transformed avatars and environmental context in group interaction in the metaverse 人、地点和时间:一项大规模的纵向研究:在虚拟世界中群体互动中转换的化身和环境背景

J. Comput. Mediat. Commun. Pub Date : 2023-01-01 DOI: 10.1093/jcmc/zmac031

Eugy Han, M. R. Miller, C. Deveaux, Hanseul Jun, Kristine L. Nowak, Jeffrey T. Hancock, Nilam Ram, J. Bailenson

{"title":"People, places, and time: a large-scale, longitudinal study of transformed avatars and environmental context in group interaction in the metaverse","authors":"Eugy Han, M. R. Miller, C. Deveaux, Hanseul Jun, Kristine L. Nowak, Jeffrey T. Hancock, Nilam Ram, J. Bailenson","doi":"10.1093/jcmc/zmac031","DOIUrl":"https://doi.org/10.1093/jcmc/zmac031","url":null,"abstract":"As the metaverse expands, understanding how people use virtual reality to learn and connect is increasingly important. We used the Transformed Social Interaction paradigm (Bailenson, J. N., Beall, A. C., Loomis, J., Blascovich, J., & Turk, M. (2004). Transformed social interaction: Decoupling representation from behavior and form in collaborative virtual environments. Presence: Teleoperators and Virtual Environments , 13 (4), 428–441) to examine different avatar identities and environments over time. In Study 1 ( n ¼ 81), entitativity, presence, enjoyment, and realism increased over 8 weeks. Avatars that resembled participants increased synchrony, similarities in moment-to-moment nonverbal behaviors between participants. Moreover, self-avatars increased self-presence and realism, but decreased enjoyment, compared to uniform avatars. In Study 2 ( n ¼ 137), participants cycled through 192 unique virtual environments. As visible space increased, so did nonverbal synchrony, per- ceived restorativeness, entitativity, pleasure, arousal, self- and spatial presence, enjoyment, and realism. Outdoor environments increased perceived restorativeness and enjoyment more than indoor environments. Self-presence and realism increased over time in both studies. We dis- cuss implications of avatar appearance and environmental context on social behavior in classroom contexts over time.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73272036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Novel Multiband Millimeter Wave Antennas 新型多波段毫米波天线

J. Comput. Mediat. Commun. Pub Date : 2023-01-01 DOI: 10.12720/jcm.18.1.1-14

A. Galib, Nayan Sarker, M. Mondal

{"title":"Novel Multiband Millimeter Wave Antennas","authors":"A. Galib, Nayan Sarker, M. Mondal","doi":"10.12720/jcm.18.1.1-14","DOIUrl":"https://doi.org/10.12720/jcm.18.1.1-14","url":null,"abstract":"The design of multiband antennas is useful for providing multiple resonance frequencies required for multiple application scenarios. However, there is a scarcity of compact-sized antennas in the 70-110 GHz band. In this regard, this paper proposes two multiband millimeter wave antennas in the W and D bands. A small-sized antenna operating at five different frequencies (penta band) with an overall dimension of 4.8 × 5.4 mm2 and resonances at 35.84 GHz, 46.07 GHz, 56.74 GHz, 81.6 GHz, and 110.09 GHz is proposed first. The second one is an array antenna from the first antenna with a size of 11.1 by 6.4 mm2 and resonances at 28.03 GHz, 36.5 GHz, 53.11 GHz, 65.98 GHz, 77.64 GHz, 89.3 GHz, 100.52 GHz, 111.74 GHz, and 122.19 GHz. Computer Simulation Technology (CST) Microwave Studio tool is used for antenna design purposes. At the two larger frequencies of 81.6 GHz and 110.09 GHz of the first antenna, (the BW, the directivity, the gain, and radiation efficiency) are (3.3 GHz, 6.486 dBi, 6.22 dB, and 94.06%), and (10.01 GHz, 8.797 dBi, 8.506 dB, and 93.52%), respectively. At 77.64 GHz, and 111.74 GHz of the array antenna, (the BW, the directivity, the gain, and radiation efficiency) are (3.73 GHz, 12.35 dBi, 10.68 dB, and 67.9%), (4.4 GHz, 15.31 dBi, 14.07 dB, and 75.23%), respectively. The advantage of the proposed antennas over the currently available 80 GHz and 110 GHz antennas is that they are compact in size while maintaining high bandwidth and gain. Hence, the proposed antennas have potential applications in satellite communications, the Internet of things, compact biomedical devices, and interferometry radars.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"31 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85717176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mediating social support through sensor-based technologies for children's health behavior change 通过基于传感器的技术调节儿童健康行为改变的社会支持

J. Comput. Mediat. Commun. Pub Date : 2023-01-01 DOI: 10.1093/jcmc/zmad011

Joshua Baldwin, Joomi Lee, Allan D. Tate, Christian D. Okitondo, Kyle Johnsen, Michael D. Schmidt, Stephen L. Rathbun, Eric Novotny, Sun Joo Grace Ahn

引用次数: 0